| 1 | /* provide a replacement openat function
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| 2 | Copyright (C) 2004-2006, 2008-2012 Free Software Foundation, Inc.
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| 3 |
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| 4 | This program is free software: you can redistribute it and/or modify
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| 5 | it under the terms of the GNU General Public License as published by
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| 6 | the Free Software Foundation; either version 3 of the License, or
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| 7 | (at your option) any later version.
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| 8 |
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| 9 | This program is distributed in the hope that it will be useful,
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 12 | GNU General Public License for more details.
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| 13 |
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| 14 | You should have received a copy of the GNU General Public License
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| 15 | along with this program. If not, see <http://www.gnu.org/licenses/>. */
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| 16 |
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| 17 | /* written by Jim Meyering */
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| 18 |
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| 19 | #ifndef _GL_HEADER_OPENAT
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| 20 | #define _GL_HEADER_OPENAT
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| 21 |
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| 22 | #include <fcntl.h>
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| 23 |
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| 24 | #include <sys/types.h>
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| 25 | #include <sys/stat.h>
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| 26 | #include <unistd.h>
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| 27 | #include <stdbool.h>
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| 28 |
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| 29 | #if !HAVE_OPENAT
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| 30 |
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| 31 | int openat_permissive (int fd, char const *file, int flags, mode_t mode,
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| 32 | int *cwd_errno);
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| 33 | bool openat_needs_fchdir (void);
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| 34 |
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| 35 | #else
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| 36 |
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| 37 | # define openat_permissive(Fd, File, Flags, Mode, Cwd_errno) \
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| 38 | openat (Fd, File, Flags, Mode)
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| 39 | # define openat_needs_fchdir() false
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| 40 |
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| 41 | #endif
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| 42 |
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| 43 | _Noreturn void openat_restore_fail (int);
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| 44 | _Noreturn void openat_save_fail (int);
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| 45 |
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| 46 | /* Using these function names makes application code
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| 47 | slightly more readable than it would be with
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| 48 | fchownat (..., 0) or fchownat (..., AT_SYMLINK_NOFOLLOW). */
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| 49 |
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| 50 | #if GNULIB_FCHOWNAT
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| 51 |
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| 52 | static inline int
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| 53 | chownat (int fd, char const *file, uid_t owner, gid_t group)
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| 54 | {
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| 55 | return fchownat (fd, file, owner, group, 0);
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| 56 | }
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| 57 |
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| 58 | static inline int
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| 59 | lchownat (int fd, char const *file, uid_t owner, gid_t group)
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| 60 | {
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| 61 | return fchownat (fd, file, owner, group, AT_SYMLINK_NOFOLLOW);
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| 62 | }
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| 63 |
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| 64 | #endif
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| 65 |
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| 66 | #if GNULIB_FCHMODAT
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| 67 |
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| 68 | static inline int
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| 69 | chmodat (int fd, char const *file, mode_t mode)
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| 70 | {
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| 71 | return fchmodat (fd, file, mode, 0);
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| 72 | }
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| 73 |
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| 74 | static inline int
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| 75 | lchmodat (int fd, char const *file, mode_t mode)
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| 76 | {
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| 77 | return fchmodat (fd, file, mode, AT_SYMLINK_NOFOLLOW);
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| 78 | }
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| 79 |
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| 80 | #endif
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| 81 |
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| 82 | #if GNULIB_FSTATAT
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| 83 |
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| 84 | static inline int
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| 85 | statat (int fd, char const *name, struct stat *st)
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| 86 | {
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| 87 | return fstatat (fd, name, st, 0);
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| 88 | }
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| 89 |
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| 90 | static inline int
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| 91 | lstatat (int fd, char const *name, struct stat *st)
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| 92 | {
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| 93 | return fstatat (fd, name, st, AT_SYMLINK_NOFOLLOW);
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| 94 | }
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| 95 |
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| 96 | #endif
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| 97 |
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| 98 | /* For now, there are no wrappers named laccessat or leuidaccessat,
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| 99 | since gnulib doesn't support faccessat(,AT_SYMLINK_NOFOLLOW) and
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| 100 | since access rights on symlinks are of limited utility. Likewise,
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| 101 | wrappers are not provided for accessat or euidaccessat, so as to
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| 102 | avoid dragging in -lgen on some platforms. */
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| 103 |
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| 104 | #endif /* _GL_HEADER_OPENAT */
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